Re: Please apply commit 06e472acf964 ("scsi: mpt3sas: Remove usage of dma_get_required_mask() API") to stable series

[Salvatore Bonaccorso <carnil@debian.org>]

Hi Martin,

On Wed, Mar 08, 2023 at 02:05:01PM -0500, Martin K. Petersen wrote:
> 
> Salvatore,
> 
> > So I believe the right thing would be to revert first in the stable
> > series where it was applied (5.10.y, 5.15.y) the commit e0e0747de0ea
> > ("scsi: mpt3sas: Fix return value check of dma_get_required_mask()")
> > and then on top of this revert apply the patches:
> >
> > 9df650963bf6 ("scsi: mpt3sas: Don't change DMA mask while reallocating pools")
> > 1a2dcbdde82e ("scsi: mpt3sas: re-do lost mpt3sas DMA mask fix")
> > 06e472acf964 ("scsi: mpt3sas: Remove usage of dma_get_required_mask() API")
> >
> > Attached mbox file implements this.
> >
> > Does that looks now good for resolving the regression?
> 
> Yes, that's one way to resolve it.
> 
> At a quick glance your mbox looks fine. Best way to validate would be to
> compare the resulting _base_config_dma_addressing() function between
> your tree and upstream. I don't believe we have had additional changes
> here so there should be no delta.

Yes, the resulting _base_config_dma_addressing() function is the same
after applying the series of commits.

In both cases it will be:

/**
 * _base_config_dma_addressing - set dma addressing
 * @ioc: per adapter object
 * @pdev: PCI device struct
 *
 * Return: 0 for success, non-zero for failure.
 */
static int
_base_config_dma_addressing(struct MPT3SAS_ADAPTER *ioc, struct pci_dev *pdev)
{
        struct sysinfo s;
        u64 coherent_dma_mask, dma_mask;

        if (ioc->is_mcpu_endpoint || sizeof(dma_addr_t) == 4) {
                ioc->dma_mask = 32;
                coherent_dma_mask = dma_mask = DMA_BIT_MASK(32);
        /* Set 63 bit DMA mask for all SAS3 and SAS35 controllers */
        } else if (ioc->hba_mpi_version_belonged > MPI2_VERSION) {
                ioc->dma_mask = 63;
                coherent_dma_mask = dma_mask = DMA_BIT_MASK(63);
        } else {
                ioc->dma_mask = 64;
                coherent_dma_mask = dma_mask = DMA_BIT_MASK(64);
        }

        if (ioc->use_32bit_dma)
                coherent_dma_mask = DMA_BIT_MASK(32);

        if (dma_set_mask(&pdev->dev, dma_mask) ||
            dma_set_coherent_mask(&pdev->dev, coherent_dma_mask))
                return -ENODEV;

        if (ioc->dma_mask > 32) {
                ioc->base_add_sg_single = &_base_add_sg_single_64;
                ioc->sge_size = sizeof(Mpi2SGESimple64_t);
        } else {
                ioc->base_add_sg_single = &_base_add_sg_single_32;
                ioc->sge_size = sizeof(Mpi2SGESimple32_t);
        }

        si_meminfo(&s);
        ioc_info(ioc, "%d BIT PCI BUS DMA ADDRESSING SUPPORTED, total mem (%ld kB)\n",
                ioc->dma_mask, convert_to_kb(s.totalram));

        return 0;
}

Regards,
Salvatore